Buy the Tapo P110M if you want an alert tied to one plug-in appliance. Its power-protection setting shuts the outlet off when power exceeds a threshold you set, and TP-Link rates it for 15A, 1,800W general use. Choose the Emporia Vue 3 if the real problem is finding which circuit changed, since Emporia lists customizable notifications such as a sump pump running continuously. Choose the Shelly Pro 3EM V2 only if you want a professionally installed meter and are comfortable building your own rules.

Pick Alert scope Key sourced spec Buy
Tapo P110M One plug-in appliance 100-125V, 15A/1,800W resistive, 1/6 HP motor limit; auto-off and power protection Tapo P110M 2-pack on Amazon
Emporia Vue 3 Whole home plus up to 16 circuits Custom notifications; needs internet and the Emporia cloud; 2.4 GHz Wi-Fi Emporia Vue 3 on Amazon
Shelly Pro 3EM V2 Three-channel meter for custom rules Amazon listing: 120A v2, Wi-Fi, Matter and LAN Shelly Pro 3EM 120A v2 on Amazon

Tapo P110M: best for one appliance

The alert, the reading and the shutoff all apply to the same outlet, which is why this is the clearest buy. TP-Link’s page lists real-time usage, past-7-day totals, an electricity-rate field for cost estimates, auto-off timers, Matter certification and a power-protection setting that cuts power above a threshold. It lists 100-125V, 15A/1,800W for general resistive loads and a 1/6 HP motor rating. The page does not mention push notifications, so confirm in the Tapo app that it sends the alert you want before you rely on it.

An energy threshold is not a safety device. Do not put medical equipment, refrigeration, network gear or security equipment behind an automatic shutoff, and stay within the plug’s rating. Details are in the Tapo P110M review .

Emporia Vue 3: best for finding the circuit

Pick this when you need to know whether a heat pump, EV charger, water heater or workshop circuit has changed. The kits include two 200A main sensors, and the 8- and 16-sensor kits add 50A circuit sensors. It installs in the electrical panel, so plan on a licensed electrician. Emporia says the app is free and lists no subscription, but the unit has no local storage and needs an active internet connection for real-time data. If an alert must work inside your home network, look elsewhere. See local versus cloud monitoring .

Shelly Pro 3EM V2: best for custom rules

The Amazon listing for the 120A v2 describes Wi-Fi, Matter and LAN connectivity and a 3-phase energy meter. Shelly’s own page did not show readable specs when this page was researched, so this page does not list alert, scripting or mounting details here; read the maker page before buying. This is electrical equipment that goes in the panel area, so use a licensed electrician.

How to choose

Write the alert as five parts: source (which outlet or circuit), condition, duration, action (notify, switch off, or both) and delivery (account, internet, phone permissions). A device that supports one part may not support the whole rule. Start with a week of normal readings, then set the threshold above the usual running level. Narrow alerts work best: a dehumidifier staying on too long, a plug load left on after bedtime, a circuit whose daily baseline jumps.

Consumer apps update on their own schedules, so treat “real time” as near-real-time. Do not use an energy app as a fire, freezer, medical or security alarm; buy a sensor listed for that condition.

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